EP0110381A2 - Apparatus for regulating the movement of a movable member - Google Patents
Apparatus for regulating the movement of a movable member Download PDFInfo
- Publication number
- EP0110381A2 EP0110381A2 EP83111959A EP83111959A EP0110381A2 EP 0110381 A2 EP0110381 A2 EP 0110381A2 EP 83111959 A EP83111959 A EP 83111959A EP 83111959 A EP83111959 A EP 83111959A EP 0110381 A2 EP0110381 A2 EP 0110381A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- movable member
- detecting means
- rest position
- drive
- detecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B27/00—Photographic printing apparatus
- G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
- G03B27/52—Details
- G03B27/522—Projection optics
- G03B27/525—Projection optics for slit exposure
- G03B27/526—Projection optics for slit exposure in which the projection optics move
Definitions
- the present invention is directed to an apparatus for regulating the movement of a movable member, particularly a portion of an electrostatic copying machine which is moved to expose an original which is to be copied onto a sheet of copy paper.
- an apparatus including drive means for moving the movable member in a first direction from a rest position to an operative position and for moving the movable member in a second direction, opposite to the first direction, from the operative position toward the rest position, first detecting means for detecting the presence of the movable member at the rest position, and second detecting means for detecting the presence of the movable member at a location adjacent the rest position but upstream, thereof with respect to the second direction.
- Control means is operatively connected to the drive means and to the first and second detecting means for operating the drive means to move the movable member in the first direction and then in the second direction, for stopping the drive means upon detection of the movable member, moving in the second direction, at the location by the second detecting means, whereafter the movable member continues to move by inertia in the second direction from the location to the rest position and is detected thereat by the first detecting means, and for, if the movable member is not detected at the rest position by the first detecting means within a predetermined time period after the detection by the second detecting means, again starting the drive means to move the movable member in the second direction until detection thereof by the first detecting means.
- the drive means may include a first drive assembly for driving the movable member in the first direction, and a second drive assembly for driving the movable member in the second direction, the control means being operatively connected to the first and second drive assemblies.
- the movable member includes a movable portion of an electrostatic copying machine, such as the exposing unit thereof or the original supporting platen and the original, which is moved in the first direction during exposure of the original, and the apparatus of the invention further includes a third detecting means, positioned downstream of the second detecting means with respect to the first direction and operatively connected to the control means, for detecting the movement of the movable portion for commencing feeding of a copy paper sheet.
- the detecting means may each include a light emitting element and a light receiving element, and the apparatus may further include a light shield member mounted for movement with the movable member between respective of the light emitting and receiving elements.
- FIG. 1 shown in Figure 1 is a transfer type electrostatic copying machine including a copying machine body 1 having fixedly positioned at the top thereof a transparent plate 2 adapted to support an original 3 to be copied.
- a cover 4 presses the original 3 against transparent plate 2.
- the machine includes an exposing unit to form an image of the original 3 on a photosensitive member 5.
- Exposing unit 6 includes an exposing lamp 7 for illuminating original 3, a reflecting mirror 8 for applying light from the exposing lamp 7 to the original 3, reflecting mirrors 31, 9 and 10 for reflecting the image of the original, a condensor lens 11 and a reflecting mirror 12 for transmitting the image of the original to an exposure region 13 on the photosensitive member 5.
- a charging corona discharger 15 is provided adjacent the photo-sensitive member 5.
- a latent image formed at the exposure region 13 is developed into a toner image by a magnetic brush developing unit 16.
- Sheets of copying paper are conveyed selectively from supplies 17 and 18, such as cassettes, provided at one side of machine body 1 by means of supplying rollers 19 and 20 and pairs of conveying rollers 21, 22 and 2 3, and then are guided by guide means 24.
- the toner image is transferred from the surface of photosensitive member 5 onto a particular copy paper sheet by a transferring corona discharger 25.
- a discharging corona discharger 30 is provided adjacent the transferring corona discharger 25, and more specifically, is located downstream of photosensitive member 5 in the direction of rotation thereof, as indicated by arrow 14.
- the imaged copy paper sheet is peeled off from the photosensitive member 5 by corona discharger 30 and is conveyed by an endless conveying belt 26 to a fixing unit 27.
- the finished copy paper sheet is delivered onto a tray 29 provided on an opposite side of the copying machine body 1.
- FIG 2 is a perspective view of a drive means 52 included in the exposing unit 6 shown in Figure 1.
- the exposing lamp 7 and reflecting mirrors 8, 31 are fixed to the supports 32, 33 and are movable horizontally in the direction of arrow 40 on guide bars 34, 35.
- Reflecting mirrors 9 . and 10 are fixedly mounted on a support 36 which is movable horizontally in the direction of arrow 40 on guide bars 35, 37.
- a drive member 38 is fixedly secured to and extends downwardly from the support 32.
- a vertically extending elongated hole 39 is formed in drive member 38, and a drive protrusion 41 loosely fits into elongated hole 39.
- Drive protrusion 41 is fixedly connected to the lower half 44a of an endless chain 44 which extends horizontally around sprocket wheels 42, 43.
- Wires or cables 48, 49 extend around pulleys 45, 46 which are mounted rotatably on machine body 1 and around a pulley 47 which is rotatably mounted on support 36.
- one end of cable 48 is connected to support 32, the cable then is wound around pulleys 45, 46, 47, and the opposite end of such cable is connected to machine body 1.
- one end of cable 49 is connected to support 32, the cable then is wound around pulley 47, and the opposite end of the cable is connected to machine body 1.
- reflecting mirrors 9, 10 are moved at a speed which is half of the speed of exposing lamp 7 and reflecting mirrors 8, 31. Then the exposing lamp 7 and reflecting mirrors 8, 31 are at a rest position indicated by the solid lines in Figure 1, the reflecting mirrors 9, 10 will be at the position indicated by the solid lines in Figure 1. When the exposing lamp 7 and reflecting mirrors 8, 31 are moved to the rightmost position as viewed in Figure 1, i.e. as indicated by dashed lines 50 in Figure 1, at the end of an exposure operation, the reflecting mirrors 9, 10 will be at the position indicated by the dashed lines 51 in Figure 1.
- Figure 3 is a simplified sectional view showing a portion-of the drive device 52 for driving the exposing lamp 7 and reflecting mirrors 8, 31.
- Figure 4 is an enlarged partial view of the righthand portion of the structure shown in Figure 4.
- Figure 5 is a perspective view of a detailed structural arrangement of the drive device.
- drive member 38 In the case of an original 3 having a Japanese Industrial Standard size "A4", drive member 38 is moved to the position indicated by the dashed lines 59 in Figure 3, and in the case of an original 3 having a Japanese Industrial Standard size "A3" which is longer than size "A4" in the direction of movement, drive member 38 is moved to the position indicated by the dashed lines 60 in Figure 3. After the drive member 38 is moved to one of such positions, or to another predetermined position, chain 44 then is moved in the opposite direction, such that drive member 38 is moved in a direction opposite to that indicated by arrow 40, i.e. in a return direction.
- electromagnetic clutch 53 is released, and the power from a drive source 61 is transmitted through a chain 62, a sprocket wheel 63, an electro-magnetic clutch 64, and gears 65-68 to sprocket wheel 43 which is coaxially fixed to gear 68.
- electromagnetic clutch 64 is released.
- a light shield member 71 is fixedly installed on support 32 with drive member 38.
- First, second and third detecting elements 72, 73, 74, respectively, are provided to detect movement of light shield member 71 in the direction of arrow 40 and in the opposite direction.
- First detecting element 72 detects when light shield member 71, and thereby exposing lamp 7 and reflecting mirrors 8, 31, are at the rest position.
- Second detecting element 73 is provided at a position downstream of but adjacent to first detecting element 72, with respect to direction 40.
- Third detecting element 74 is provided downstream of second detecting element 73, with respect to the direction of arrow 40.
- the first, second and third detecting elements 72, 73, 74 each are formed of a light emitting element and a light receiving element in confronting relationship.
- a detection operation is carried out when light shield member 71 intercepts the light emitted from a particular emitting element such that the light is not received by the respective light receiving element.
- Third detecting element 74 is operable to detect the movement of light shield member 71 in the direction of arrow 40, that is during an exposure operation, at a particular instant to initiate the operation of supplying rollers 19/20 to supply a copy paper sheet from one of the cassettes 17, 18.
- Figure 6 is an electrical circuit diagram for first, second and third detecting elements 72, 73, 74, respectively, and the associated structural elements.
- second detecting element 73 light emitted by its light emitting element 76 is received by,its light receiving element 78.
- the -output of the light receiving 78 is differentiated by a differentiation capacitor 79.
- a diode 80 applies only a positive pulse from capacitor 79 to one input terminal 82 of a comparison circuit 81, the other input terminal 83 of comparison circuit 81 receiving a reference voltage for defining a discrimination level which is provided by means of a voltage-dividing resistors 84, 85.
- Input terminal 82 is connected to a resistor 86.
- the output 87 of comparison circuit 81 is applied to a time constant circuit 90 formed of a resistor 88 and a capacitor 89.
- Figure 7 shows a simplified output side of comparison circuit 81.
- an open collector type transistor 91 is rendered conductive and has a low level output.
- time constant circiut 90 is applied to one input terminal 93 of a second comparison circuit 92, the other input terminal 94 of which receives a reference voltage which is provided by means of voltage dividing resistors 84, 85.
- Comparison circuit 92 is similar in arrangement to comparison circiut 81, and the output 95 of comparison circuit 92 is applied to the light receiving element 96 of first detecting element 72. In first detecting element 72, light emitted by its light emitting element 97 is received by light receiving element 96. The output of light receiving element 96 is clamped at a high level by a resistor 98.
- a control circuit 99 including a suitable microcomputer, as will be understood by those skilled in the art, receives signals from light receiving element 96, third detecting element 74, and a print buttom 100, thereby to control electromagnetic clutches 53, 64, the operation of which was discussed above.
- light shield member 71 allows light receiving element 96 to receive light from light emitting element 97 of first detecting element 72.
- input 82 of comparison circuit 81 is maintained at low level by resistor 86 as shown at graph (4) of Figure 8, and therefore output 87 is at high level. Therefore, input 93 of comparison circiut 92 is at high level as shown at graph (5) of Figure 8, and output 95 is at low level as shown by graph (6) of Figure 8. Therefore, after time t 2 , ;light receiving element 96 applies a low level signal through line 101 to control circuit 99 as shown at graph (3) of Figure 8.
- light shield member 71 moves further in the direction of arrow 40, at a time t 3 light receiving element 78 receives light from light emitting element 76 of the second detecting element 73. Thereafter, exposing lamp 7 and reflecting mirrors 8, 31, 9, 10, together with drive member 38, are further moved in the direction of arrow 40, thereby achieving an exposure operation.
- third detecting element 74 at a suitable predetermined time detects light shield member 71 to initiate supply of a copy paper sheet from one of cassettes 17/18.
- the electromagnetic clutch 53 is disengaged, and electromagnetic clutch 64 is engaged to move the elements in the reverse or return direction.
- comparison circuit 81 provides a high level signal at output terminal 95 until a time instant t 6 when input 93 reaches the discrimination level l.
- control circuit 99 releases electromagnetic clutch 64.
- Figure 9 illustrates the operation of the apparatus of the present invention when light shield member 71 does not reach the rest position for some reason during the period between times t 4 and t 6 .
- this period between times t 4 and t 6 is the period for which the voltage at input terminal 93 of comparison circuit 92 is lower than the discrimination level L.
- Graphs (1) through (6) of Figure 9 correspond to those of Figure 8 up to and for a period after time t 4 .
- the movable member is positively returned to the rest position by inertia, with the result that the movable member or members are stopped gradually, thereby avoiding shock to the machine.
- the copied image will be sharp and clear, and also the components of the machines will not be subjected to loosening.
- the apparatus of the present invention provides that in the event that the movable member is not returned to the rest position by inertia, then such condition will be detected and the drive element again will be initiated to complete such return movement.
Abstract
Description
- The present invention is directed to an apparatus for regulating the movement of a movable member, particularly a portion of an electrostatic copying machine which is moved to expose an original which is to be copied onto a sheet of copy paper.
- In electrostatic copying machines, it is known to move, during exposure of an original, either a platen supporting the original and the original, or an exposing unit. It is desirable that the driving assembly for achieving such movement relatively gently stops the movable member after the exposure operation, since otherwise shocks are imparted to the movable member, thus causing blurring of the resultant image and/or shaking of the copying machine.
- Accordingly, it is an object of the present invention to provide an apparatus for regulating the movement of a movable member and for ensuring that the movable member is stopped relatively gently, thereby avoiding the occurrence of shocks imparted to the movable member.
- It is a further object of the present invention to provide such an apparatus for regulating the movement of a portion of an electrostatic copying machine which is moved during an exposure of an original, whereby it is possible to avoid shock to the movable portion, thereby avoiding blurring of the image of the original.
- These objects are achieved in accordance with the present invention by the provision of an apparatus including drive means for moving the movable member in a first direction from a rest position to an operative position and for moving the movable member in a second direction, opposite to the first direction, from the operative position toward the rest position, first detecting means for detecting the presence of the movable member at the rest position, and second detecting means for detecting the presence of the movable member at a location adjacent the rest position but upstream, thereof with respect to the second direction. Control means is operatively connected to the drive means and to the first and second detecting means for operating the drive means to move the movable member in the first direction and then in the second direction, for stopping the drive means upon detection of the movable member, moving in the second direction, at the location by the second detecting means, whereafter the movable member continues to move by inertia in the second direction from the location to the rest position and is detected thereat by the first detecting means, and for, if the movable member is not detected at the rest position by the first detecting means within a predetermined time period after the detection by the second detecting means, again starting the drive means to move the movable member in the second direction until detection thereof by the first detecting means.
- In accordance with the present invention, the drive means may include a first drive assembly for driving the movable member in the first direction, and a second drive assembly for driving the movable member in the second direction, the control means being operatively connected to the first and second drive assemblies. In accordance with a specific adaptation of the present invention, the movable member includes a movable portion of an electrostatic copying machine, such as the exposing unit thereof or the original supporting platen and the original, which is moved in the first direction during exposure of the original, and the apparatus of the invention further includes a third detecting means, positioned downstream of the second detecting means with respect to the first direction and operatively connected to the control means, for detecting the movement of the movable portion for commencing feeding of a copy paper sheet.
- The detecting means may each include a light emitting element and a light receiving element, and the apparatus may further include a light shield member mounted for movement with the movable member between respective of the light emitting and receiving elements.
- Other objects, features and advantages of the present invention will be apparent from the following detailed description, taken with the accompanying drawings, wherein:
- Figure 1 is a longitudinal sectional view showing the structure of a transfer type electrostatic copying machine of the type to which the apparatus of the present invention is particularly applicable;
- Figure 2 is a perspective view of a drive structure of the apparatus of Figure 1;
- Figure 3 is a simplified partial sectional view of part of the drive structure of Figure 2 and including the apparatus of the present invention;
- Figure 4 is an enlarged partial view of the apparatus of the present invention;
- Figure 5 is a perspective view of a specific structural arrangement of the apparatus of the present inventions-Figure 6 is an electrical circuit diagram of control means embodying the present invention;
- Figure 7 is an enlarged circuit diagram illustrating a portion of the circuit of Figure 6; and
- Figures 8 and 9 are graphs of wave forms occurring at various portions of the circuit of Figure 6 and illustrating the manner of operation of the present invention.
- The following detailed description will be with reference to regulating the movement of portions of an exposing unit of a transfer type electrostatic copying machine, during exposure of a stationary original to obtain copying of the image of the original.
- Thus, shown in Figure 1 is a transfer type electrostatic copying machine including a
copying machine body 1 having fixedly positioned at the top thereof atransparent plate 2 adapted to support an original 3 to be copied. Acover 4 presses the original 3 againsttransparent plate 2. The machine includes an exposing unit to form an image of the original 3 on aphotosensitive member 5. Exposingunit 6 includes an exposing lamp 7 for illuminating original 3, a reflectingmirror 8 for applying light from the exposing lamp 7 to the original 3, reflectingmirrors condensor lens 11 and a reflectingmirror 12 for transmitting the image of the original to anexposure region 13 on thephotosensitive member 5. Acharging corona discharger 15 is provided adjacent the photo-sensitive member 5. A latent image formed at theexposure region 13 is developed into a toner image by a magneticbrush developing unit 16. Sheets of copying paper are conveyed selectively fromsupplies machine body 1 by means of supplyingrollers conveying rollers photosensitive member 5 onto a particular copy paper sheet by a transferringcorona discharger 25. Adischarging corona discharger 30 is provided adjacent the transferringcorona discharger 25, and more specifically, is located downstream ofphotosensitive member 5 in the direction of rotation thereof, as indicated byarrow 14. The imaged copy paper sheet is peeled off from thephotosensitive member 5 bycorona discharger 30 and is conveyed by anendless conveying belt 26 to afixing unit 27. The finished copy paper sheet is delivered onto atray 29 provided on an opposite side of thecopying machine body 1. - Figure 2 is a perspective view of a drive means 52 included in the exposing
unit 6 shown in Figure 1. The exposing lamp 7 and reflectingmirrors supports arrow 40 onguide bars mirrors support 36 which is movable horizontally in the direction ofarrow 40 onguide bars drive member 38 is fixedly secured to and extends downwardly from thesupport 32. A vertically extendingelongated hole 39 is formed indrive member 38, and adrive protrusion 41 loosely fits intoelongated hole 39.Drive protrusion 41 is fixedly connected to thelower half 44a of anendless chain 44 which extends horizontally aroundsprocket wheels cables pulleys machine body 1 and around apulley 47 which is rotatably mounted onsupport 36. Specifically, one end ofcable 48 is connected to support 32, the cable then is wound aroundpulleys machine body 1. On the other hand, one end ofcable 49 is connected to support 32, the cable then is wound aroundpulley 47, and the opposite end of the cable is connected tomachine body 1. By this arrangement, reflectingmirrors mirrors mirrors reflecting mirrors mirrors dashed lines 50 in Figure 1, at the end of an exposure operation, thereflecting mirrors dashed lines 51 in Figure 1. - Figure 3 is a simplified sectional view showing a portion-of the
drive device 52 for driving the exposing lamp 7 and reflectingmirrors mirrors drive member 38, are at the rest position indicated by the solid lines in Figure 3 and the dashed lines in Figures 4 and 5, thedrive protrusion 41 is located on that side ofsprocket wheel 42 opposite to sprocketwheel 43. During an exposure operation, power from adrive source 70 is transmitted through anelectromagnetic clutch 53 to agear 54 and to achain 58 extending around asprocket 55 fixed coaxially togear 54 and aroundadditional sprocket wheels sprocket wheel 42 which is coaxially secured to sprocketwheel 57.Drive protrusion 41 commences moving from a position on the periphery ofsprocket wheel 42 which is furthest fromsprocket wheel 43. Thus, with thechain 58 running at a constant speed, the speed ofdrive member 38 gradually increases while the drive protrusion passes along approximately one quarter of the circumference ofsprocket wheel 42. In the case of an original 3 having a Japanese Industrial Standard size "A4",drive member 38 is moved to the position indicated by thedashed lines 59 in Figure 3, and in the case of an original 3 having a Japanese Industrial Standard size "A3" which is longer than size "A4" in the direction of movement,drive member 38 is moved to the position indicated by thedashed lines 60 in Figure 3. After thedrive member 38 is moved to one of such positions, or to another predetermined position,chain 44 then is moved in the opposite direction, such thatdrive member 38 is moved in a direction opposite to that indicated byarrow 40, i.e. in a return direction. For this returning operation,electromagnetic clutch 53 is released, and the power from adrive source 61 is transmitted through achain 62, asprocket wheel 63, an electro-magnetic clutch 64, and gears 65-68 to sprocketwheel 43 which is coaxially fixed togear 68. When the power ofdrive source 70 is applied throughelectromagnetic clutch 53 to causedrive member 38 to be moved, then of courseelectromagnetic clutch 64 is released. - A
light shield member 71 is fixedly installed onsupport 32 withdrive member 38. First, second and third detectingelements light shield member 71 in the direction ofarrow 40 and in the opposite direction. First detectingelement 72 detects whenlight shield member 71, and thereby exposing lamp 7 and reflectingmirrors element 73 is provided at a position downstream of but adjacent to first detectingelement 72, with respect todirection 40. Third detectingelement 74 is provided downstream of second detectingelement 73, with respect to the direction ofarrow 40. Although various possible devices may be employed for the detecting elements, in the preferred embodiment of the present invention, the first, second and third detectingelements light shield member 71 intercepts the light emitted from a particular emitting element such that the light is not received by the respective light receiving element. Third detectingelement 74 is operable to detect the movement oflight shield member 71 in the direction ofarrow 40, that is during an exposure operation, at a particular instant to initiate the operation of supplyingrollers 19/20 to supply a copy paper sheet from one of thecassettes - Figure 6 is an electrical circuit diagram for first, second and third detecting
elements element 73, light emitted by itslight emitting element 76 is received by,itslight receiving element 78. The -output of the light receiving 78 is differentiated by adifferentiation capacitor 79. Adiode 80 applies only a positive pulse fromcapacitor 79 to oneinput terminal 82 of acomparison circuit 81, theother input terminal 83 ofcomparison circuit 81 receiving a reference voltage for defining a discrimination level which is provided by means of a voltage-dividingresistors Input terminal 82 is connected to aresistor 86. Theoutput 87 ofcomparison circuit 81 is applied to a timeconstant circuit 90 formed of aresistor 88 and acapacitor 89. - Figure 7 shows a simplified output side of
comparison circuit 81. When the level of the signal at oneinput 82 exceeds the discrimination level of theother input 83, an opencollector type transistor 91 is rendered conductive and has a low level output. - The output of time
constant circiut 90 is applied to oneinput terminal 93 of asecond comparison circuit 92, theother input terminal 94 of which receives a reference voltage which is provided by means ofvoltage dividing resistors Comparison circuit 92 is similar in arrangement tocomparison circiut 81, and theoutput 95 ofcomparison circuit 92 is applied to thelight receiving element 96 of first detectingelement 72. In first detectingelement 72, light emitted by itslight emitting element 97 is received by light receivingelement 96. The output of light receivingelement 96 is clamped at a high level by aresistor 98. Acontrol circuit 99 including a suitable microcomputer, as will be understood by those skilled in the art, receives signals from light receivingelement 96, third detectingelement 74, and aprint buttom 100, thereby to controlelectromagnetic clutches - When exposing lamp 7 and reflecting
mirrors drive member 38 and thelight shield member 71 are at the rest position, the light beams from light emittingelements elements light shield member 71. Accordingly, thelight receiving elements print button 100 is operated at time tl, whereby electromagnetic clutch 53 is engaged to drivesprocket wheel 42, so thatlight shield member 71 moves in the direction ofarrow 40. Accordingly, at a time t2,light shield member 71 allowslight receiving element 96 to receive light from light emittingelement 97 of first detectingelement 72. During this time,input 82 ofcomparison circuit 81 is maintained at low level byresistor 86 as shown at graph (4) of Figure 8, and thereforeoutput 87 is at high level. Therefore,input 93 ofcomparison circiut 92 is at high level as shown at graph (5) of Figure 8, andoutput 95 is at low level as shown by graph (6) of Figure 8. Therefore, after time t2, ;light receivingelement 96 applies a low level signal throughline 101 to controlcircuit 99 as shown at graph (3) of Figure 8. Aslight shield member 71 moves further in the direction ofarrow 40, at a time t3light receiving element 78 receives light from light emittingelement 76 of the second detectingelement 73. Thereafter, exposing lamp 7 and reflectingmirrors drive member 38, are further moved in the direction ofarrow 40, thereby achieving an exposure operation. During such movement, third detectingelement 74 at a suitable predetermined time detectslight shield member 71 to initiate supply of a copy paper sheet from one ofcassettes 17/18. After the exposure operation, theelectromagnetic clutch 53 is disengaged, and electromagnetic clutch 64 is engaged to move the elements in the reverse or return direction. During such return movement, at a time t4light shield member 71 intercepts light from light emittingelement 76 of second detectingelement 73, such that this light is not received by alight receiving element 78. Thus,transistor 91 ofcomparison circuit 81 is rendered conductive for a short period of time by the action ofdifferentiation capacitor 79. Accordingly,capacitor 89 is instantaneously discharged throughtransistor 91, and then is gradually charged throughresistor 88 as shown at graph (5) of Figure 8. Thus,comparison circiut 92 provides a high level signal atoutput terminal 95 until a timeinstant t 6 wheninput 93 reaches the discrimination level ℓ. At time t4 control circuit 99 releaseselectromagnetic clutch 64. As a result,light shield member 71 and accordingly exposing lamp 7 and reflectingmirrors drive member 38, continue movement in the return direction by inertia only and are not positively driven. When these elements operate in the intended manner and return to the rest position by inertia, then at some time t5 between times t4 and t6 thelight shield member 71 will intercept light from light emittingelement 96 of first detectingelement 72 so that such light will not be received by light receivingelement 96. Accordingly,line 101 is maintained at high level from the time t4, as indicated by graph (3) in Figure 8. - However, if for some reason the
elements light shield member 71 does not reach the rest position for some reason during the period between times t4 and t6 . In this regard, attention is directed to the fact that this period between times t4 and t6 is the period for which the voltage atinput terminal 93 ofcomparison circuit 92 is lower than the discrimination level L. Graphs (1) through (6) of Figure 9 correspond to those of Figure 8 up to and for a period after time t4. At time t4'light receiving element 78 of second detectingelement 73"is blocked as shown at graph (2) of Figure 9, whereby a pulse shown at graph (4) of Figure 9 is applied to inputterminal 82 ofcomparison circuit 81 bydifferentiation capacitor 79. Also, a voltage, which increases gradually by the action of timeconstant circuit 90 as shown at graph (5) of Figure 9, is applied to inputterminal 93 ofcomparison circuit 92.Control circuit 99, in response to a signal, shown at graph (3) of Figure 9, ofline 101, disengages electromagnetic clutch 64 for a high level period between times t4 and t6. However, when at time t6light receiving element 96 is not blocked, clutch 64 again is engaged. Therefore,light shield member 71 is further positively moved in the direction opposite to the direction ofarrow 40. Whenline 101 is raised to high level at a time t7, i.e. when light receivingelement 78 is blocked, then clutch 64 again is disengaged. Thus, in accordance with the present inventionlight shield member 71, and therebyelements - The above embodiment of the present invention has been described and illustrated with regard to movement of the exposing
unit 6. It is to be understood however that the concept of the present invention equally applies to a copying machine of the type wherein the original and the original supporting plate is moved, with the optical system remaining stationary. Furthermore, the concept of the present invention may be broadened such that it applies not only to copying machines, but also printing machines or the like. - As will be apparent from the above discussion, in accordance with the present invention the movable member is positively returned to the rest position by inertia, with the result that the movable member or members are stopped gradually, thereby avoiding shock to the machine. As a result, the copied image will be sharp and clear, and also the components of the machines will not be subjected to loosening. As further will be apparent from the above discussion, the apparatus of the present invention provides that in the event that the movable member is not returned to the rest position by inertia, then such condition will be detected and the drive element again will be initiated to complete such return movement.
- Although the present invention has been described and illustrated with respect to preferred features thereof, it is to be understood that various modifications may be made to the specifically described and illustrated structural features without departing from the scope of the present invention.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57210290A JPS59100429A (en) | 1982-11-30 | 1982-11-30 | Driving device for moving body for exposure |
JP210290/82 | 1982-11-30 |
Publications (4)
Publication Number | Publication Date |
---|---|
EP0110381A2 true EP0110381A2 (en) | 1984-06-13 |
EP0110381A3 EP0110381A3 (en) | 1986-11-20 |
EP0110381B1 EP0110381B1 (en) | 1988-10-19 |
EP0110381B2 EP0110381B2 (en) | 1991-10-30 |
Family
ID=16586944
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83111959A Expired - Lifetime EP0110381B2 (en) | 1982-11-30 | 1983-11-29 | Apparatus for regulating the movement of a movable member |
Country Status (4)
Country | Link |
---|---|
US (1) | US4519702A (en) |
EP (1) | EP0110381B2 (en) |
JP (1) | JPS59100429A (en) |
DE (1) | DE3378281D1 (en) |
Cited By (3)
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GB2185119A (en) * | 1985-12-20 | 1987-07-08 | Canon Kk | An original scanning apparatus |
EP0345590A2 (en) * | 1988-06-06 | 1989-12-13 | Polaroid Corporation | Compact hand-held apparatus for copying an illuminated image |
GB2257259A (en) * | 1991-06-24 | 1993-01-06 | Seikosha Kk | Instant photographic copier |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5895358A (en) * | 1981-11-30 | 1983-06-06 | Mita Ind Co Ltd | Electrostatic copying method and copying machine |
US4645329A (en) * | 1984-04-20 | 1987-02-24 | Sanyo Electric Co. Ltd. | Apparatus for scanning an original |
US4645328A (en) * | 1984-07-18 | 1987-02-24 | Sanyo Electric Co., Ltd | Apparatus for scanning an original |
JPS61126542A (en) * | 1984-11-26 | 1986-06-14 | Mita Ind Co Ltd | Braking device for optical part of copying machine |
JPS62102238A (en) * | 1985-10-29 | 1987-05-12 | Mita Ind Co Ltd | Original lighting device for copying machine |
GB2182781B (en) * | 1985-11-13 | 1989-10-25 | Ushio Electric Inc | Exposure intensity detecting system for copying machine |
JPS63186225A (en) * | 1987-01-28 | 1988-08-01 | Minolta Camera Co Ltd | Control device for optical system scanning |
DE69116177T2 (en) * | 1990-01-25 | 1996-07-11 | Sharp Kk | Drive device for an optical system |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US4183660A (en) * | 1978-12-11 | 1980-01-15 | Pitney-Bowes, Inc. | Timing apparatus in a copier |
GB2034906A (en) * | 1978-11-20 | 1980-06-11 | Ricoh Kk | Electrostatic copying apparatus |
JPS56114961A (en) * | 1980-02-16 | 1981-09-09 | Ricoh Co Ltd | Scanning control device of exposure scanning device |
JPS5784468A (en) * | 1980-11-14 | 1982-05-26 | Ricoh Co Ltd | Controller for driving stop position of optical system for copying machine |
GB2091892A (en) * | 1980-08-19 | 1982-08-04 | Konishiroku Photo Ind | Photocopying |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US4421402A (en) * | 1972-04-13 | 1983-12-20 | Canon Kabushiki Kaisha | Electrophotographic device |
JPS52144730U (en) * | 1976-04-28 | 1977-11-02 | ||
US4183656A (en) * | 1977-05-13 | 1980-01-15 | Minolta Camera Kabushiki Kaisha | Slit exposure type copying apparatus |
US4256399A (en) * | 1978-04-10 | 1981-03-17 | Minolta Camera Kabushiki Kaisha | Electrophotographic copying apparatus equipped with improved braking device for scanning system |
JPS5562468A (en) * | 1978-11-02 | 1980-05-10 | Canon Inc | Copy control device |
JPS5614258A (en) * | 1979-07-16 | 1981-02-12 | Canon Inc | Image forming device |
JPS5776569A (en) * | 1980-10-31 | 1982-05-13 | Ricoh Co Ltd | Control circuit of scanning system |
JPS57210326A (en) * | 1981-06-22 | 1982-12-23 | Nippon Kogaku Kk <Nikon> | Automatic focus detecting device for camera |
JPS58105139A (en) * | 1981-12-17 | 1983-06-22 | Minolta Camera Co Ltd | Data fetch system of photographic system |
-
1982
- 1982-11-30 JP JP57210290A patent/JPS59100429A/en active Pending
-
1983
- 1983-10-21 US US06/544,057 patent/US4519702A/en not_active Expired - Fee Related
- 1983-11-29 DE DE8383111959T patent/DE3378281D1/en not_active Expired
- 1983-11-29 EP EP83111959A patent/EP0110381B2/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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GB2034906A (en) * | 1978-11-20 | 1980-06-11 | Ricoh Kk | Electrostatic copying apparatus |
US4183660A (en) * | 1978-12-11 | 1980-01-15 | Pitney-Bowes, Inc. | Timing apparatus in a copier |
JPS56114961A (en) * | 1980-02-16 | 1981-09-09 | Ricoh Co Ltd | Scanning control device of exposure scanning device |
GB2091892A (en) * | 1980-08-19 | 1982-08-04 | Konishiroku Photo Ind | Photocopying |
JPS5784468A (en) * | 1980-11-14 | 1982-05-26 | Ricoh Co Ltd | Controller for driving stop position of optical system for copying machine |
Non-Patent Citations (2)
Title |
---|
PATENTS ABSTRACTS OF JAPAN, vol. 5, no. 191 (P-92)[863], 5th December 1981; & JP - A - 56 114 961 (RICOH K.K.) 09-09-1981 * |
PATENTS ABSTRACTS OF JAPAN, vol. 6, no. 168 (P-139)[1046], 2nd September 1982; & JP - A - 57 084 468 (RICOH K.K.) 26-05-1982 * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2185119A (en) * | 1985-12-20 | 1987-07-08 | Canon Kk | An original scanning apparatus |
US4870448A (en) * | 1985-12-20 | 1989-09-26 | Canon Kabushiki Kaisha | Original scanning apparatus |
GB2185119B (en) * | 1985-12-20 | 1989-12-20 | Canon Kk | An original scanning apparatus |
EP0345590A2 (en) * | 1988-06-06 | 1989-12-13 | Polaroid Corporation | Compact hand-held apparatus for copying an illuminated image |
EP0345590A3 (en) * | 1988-06-06 | 1991-06-19 | Polaroid Corporation | Compact hand-held apparatus for copying an illuminated image |
GB2257259A (en) * | 1991-06-24 | 1993-01-06 | Seikosha Kk | Instant photographic copier |
US5245382A (en) * | 1991-06-24 | 1993-09-14 | Seikosha Co., Ltd. | Instant photographic copier |
GB2257259B (en) * | 1991-06-24 | 1995-02-15 | Seikosha Kk | Instant photographic copier |
Also Published As
Publication number | Publication date |
---|---|
DE3378281D1 (en) | 1988-11-24 |
EP0110381A3 (en) | 1986-11-20 |
EP0110381B1 (en) | 1988-10-19 |
US4519702A (en) | 1985-05-28 |
EP0110381B2 (en) | 1991-10-30 |
JPS59100429A (en) | 1984-06-09 |
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